<template>
  <div>
    <div>
      <div style="margin: 10px 0">
        <el-input
          style="width: 200px"
          placeholder="请输入名称"
          suffix-icon="el-icon-search"
          v-model="name"
        ></el-input>
        <el-button class="ml-5" type="primary" @click="load">搜索</el-button>
        <el-button type="warning" @click="reset">重置</el-button>
      </div>
      <div style="margin: 10px 0">
        <el-button
          type="primary"
          @click="handleAdd"
          v-if="user.role === 'ROLE_ADMIN'"
        >新增 <i class="el-icon-circle-plus-outline"></i
        ></el-button>

      </div>
      <el-table
        :data="tableData"
        border
        stripe
        :header-cell-class-name="'headerBg'"
        @selection-change="handleSelectionChange"
      >
        <el-table-column type="selection" width="55"></el-table-column>
        <el-table-column prop="id" label="ID" width="80"></el-table-column>
        <el-table-column prop="name" label="课程名称"></el-table-column>
        <el-table-column prop="score" label="文件类型"></el-table-column>
        <el-table-column prop="times" label="课时"></el-table-column>
        <el-table-column prop="teacher" label="授课老师"></el-table-column>
        <el-table-column label="启用">
          <template slot-scope="scope">
            <el-switch
              v-model="scope.row.state"
              active-color="#13ce66"
              inactive-color="#ccc"
              @change="changeEnable(scope.row)"
            ></el-switch>
          </template>
        </el-table-column>
        <el-table-column label="操作" width="280" align="center">
          <template slot-scope="scope">
            <el-button type="primary" @click="selectCourse(scope.row.id)"
            >选课</el-button
            >
            <el-button
              type="success"
              @click="handleEdit(scope.row)"
              v-if="user.role === 'ROLE_ADMIN'"
            >编辑 <i class="el-icon-edit"></i
            ></el-button>
            <el-popconfirm
              class="ml-5"
              confirm-button-text="确定"
              cancel-button-text="我再想想"
              icon="el-icon-info"
              icon-color="red"
              title="您确定删除吗？"
              @confirm="del(scope.row.id)"
            >
              <el-button
                type="danger"
                slot="reference"
                v-if="user.role === 'ROLE_ADMIN'"
              >删除 <i class="el-icon-remove-outline"></i
              ></el-button>
            </el-popconfirm>
          </template>
        </el-table-column>
      </el-table>

      <div style="padding: 10px 0">
        <el-pagination
          @size-change="handleSizeChange"
          @current-change="handleCurrentChange"
          :current-page="pageNum"
          :page-sizes="[2, 5, 10, 20]"
          :page-size="pageSize"
          layout="total, sizes, prev, pager, next, jumper"
          :total="total"
        >
        </el-pagination>
      </div>

      <el-dialog title="课程信息" :visible.sync="dialogFormVisible" width="30%">
        <el-form label-width="80px" size="small">
          <el-form-item label="名称">
            <el-input v-model="form.name" autocomplete="off"></el-input>
          </el-form-item>
          <el-form-item label="学分">
            <el-input v-model="form.score" autocomplete="off"></el-input>
          </el-form-item>
          <el-form-item label="课时">
            <el-input v-model="form.times" autocomplete="off"></el-input>
          </el-form-item>
          <el-form-item label="老师">
            <el-select clearable v-model="form.teacherId" placeholder="请选择">
              <el-option
                v-for="item in teachers"
                :key="item.id"
                :label="item.nickname"
                :value="item.id"
              ></el-option>
            </el-select>
          </el-form-item>
        </el-form>
        <div slot="footer" class="dialog-footer">
          <el-button @click="dialogFormVisible = false">取 消</el-button>
          <el-button type="primary" @click="save">确 定</el-button>
        </div>
      </el-dialog>
    </div>
  </div>
</template>

<script>
export default {
  name: "Course",
  data() {
    return {
      form: {},
      tableData: [],
      name: "",
      multipleSelection: [],
      pageNum: 1,
      pageSize: 10,
      total: 0,
      dialogFormVisible: false,
      teachers: [],
      user: localStorage.getItem("user")
        ? JSON.parse(localStorage.getItem("user"))
        : {},
    };
  },
  created() {
    this.load();
  },
  methods: {
    selectCourse(courseId) {
      this.request
        .post("/course/studentCourse/" + courseId + "/" + this.user.id)
        .then((res) => {
          if (res.code === "200") {
            this.$message.success("选课成功");
          } else {
            this.$message.success(res.msg);
          }
        });
    },
    load() {
      this.request
        .get("/course/page", {
          params: {
            pageNum: this.pageNum,
            pageSize: this.pageSize,
            name: this.name,
          },
        })
        .then((res) => {
          this.tableData = res.data.records;
          this.total = res.data.total;
        });

      this.request.get("/user/role/ROLE_TEACHER").then((res) => {
        this.teachers = res.data;
      });
    },
    changeEnable(row) {
      this.request.post("/course/update", row).then((res) => {
        if (res.code === "200") {
          this.$message.success("操作成功");
        }
      });
    },
    handleAdd() {
      this.dialogFormVisible = true;
      this.form = {};
    },
    handleEdit(row) {
      this.form = JSON.parse(JSON.stringify(row));
      this.dialogFormVisible = true;
    },
    del(id) {
      this.request.delete("/course/" + id).then((res) => {
        if (res.code === "200") {
          this.$message.success("删除成功");
          this.load();
        } else {
          this.$message.error("删除失败");
        }
      });
    },
    handleSelectionChange(val) {
      console.log(val);
      this.multipleSelection = val;
    },
    delBatch() {
      let ids = this.multipleSelection.map((v) => v.id); // [{}, {}, {}] => [1,2,3]
      this.request.post("/course/del/batch", ids).then((res) => {
        if (res.code === "200") {
          this.$message.success("批量删除成功");
          this.load();
        } else {
          this.$message.error("批量删除失败");
        }
      });
    },
    save() {
      this.request.post("/course", this.form).then((res) => {
        if (res.code === "200") {
          this.$message.success("保存成功");
          this.dialogFormVisible = false;
          this.load();
        } else {
          this.$message.error("保存失败");
        }
      });
    },
    reset() {
      this.name = "";
      this.load();
    },
    handleSizeChange(pageSize) {
      console.log(pageSize);
      this.pageSize = pageSize;
      this.load();
    },
    handleCurrentChange(pageNum) {
      console.log(pageNum);
      this.pageNum = pageNum;
      this.load();
    },
    download(url) {
      window.open(url);
    },
  },
};
</script>

<style>

</style>
